Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d93684ee518be22…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 18:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8e3905325de8a6ef59d5e5d880faae4c SHA-1: 75b6497366b85c10243695b7ab798b98331ef8ef SHA-256: 4d93684ee518be22914068d15f47311debcb90a819c8c60e6fff4af50b536348
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, as indicated by heuristics like PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing or trojan variant. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/910571039bdb99df949e981163764427/jevusesazejiti.pdf In PDF document text
    • http://drkoopman.nl/cmsimages/file/zazimabikaka.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/dinalate.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ktasrpribv7g4effjsbhnueh3m/bufaroroluket.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/rosafozawelokariwiwomutuv.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/jelukedumoxonizi.pdfIn PDF document text
    • http://rahwayhigh.com/clients/42761/File/28962477824.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091186c5351b---korukelijomare.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/92b3d9e70ba27cd7bd17e5702d2f3711/mamovewujidinigunurabuk.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/farisexikav.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/mibamadu.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/moruna.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/18013114836.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/e9718c8742d60c308d0db119244db648/34678294769.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/61322460316.pdfIn PDF document text
    • https://advik.net/userfiles/file/77148259821.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/22516105474.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/3679310111.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/litevuviwepagika.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/f8d1d6d1889672ad590093479eda9518/59680168202.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/57062172035.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/vovaguvazunodob.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faee9a5a89---refuvogimogomevebopemuli.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/bibujudejadumomowixex.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/latesokirawuganewor.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/34176891339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=automatic+room+light+controller+with+visitor+counter+using+arduino+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DD 11300 bytes
SHA-256: 592ab5e449474b51e54ba90d2a9956924a1a80b3eecdfb669f5a1066e1feeaeb
font_01_sfnt_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 17444 bytes
SHA-256: 0793913e51497d70492184edd57453d93d89913ce5e4cf1a7cd4ff98fffa3fbd
font_02_sfnt_off00011f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1